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Rational Design of Branched WO3 Nanorods Decorated with BiVO4 Nanoparticles by All-Solution Processing for Efficient Photoelectrochemical Water Splitting

Authors
Kim, Jae-HyeokKim, Do HongYoon, Ji WonDai, ZhengfeiLee, Jong-Heun
Issue Date
6월-2019
Publisher
AMER CHEMICAL SOC
Keywords
branched WO3 nanorod; BiVO4; type II heterojunction; all-solution process; photoelectrochemical water splitting
Citation
ACS APPLIED ENERGY MATERIALS, v.2, no.6, pp.4535 - 4543
Indexed
SCIE
SCOPUS
Journal Title
ACS APPLIED ENERGY MATERIALS
Volume
2
Number
6
Start Page
4535
End Page
4543
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/65240
DOI
10.1021/acsaem.9b00776
ISSN
2574-0962
Abstract
The formation of heterostructure between BiVO4 and WO3 is a promising strategy to design a high-performance photoanode. In this study, we prepared the highly crystalline branched WO3 nanorods decorated with BiVO4 nanoparticles by all-solution processes and achieved high photoelectrochemical (PEC) performances through the morphological design of WO3 bottom layer and BiVO4 decorations. WO3 nanorods with epitaxially grown nanobranches could be prepared via two-step hydrothermal method, and the BiVO4/WO3 heterostructure was formed by sequent electrodeposition of BiVO4 nanoparticles on branched WO3 nanorods. In comparison to bare WO3 nanorods counterpart, the macelike branched WO3 nanorods can present the enlarged surface area and improved light trapping properties from the morphological control of WO3 hierarchical nanostructures, endowing a 32.8% higher photocurrent around 0.85 mA/cm(2) at 1.23 V vs reversible hydrogen electrode (RHE). While decorated with BiVO4 nanoparticles, the as-fabricated BiVO4/macelike WO3 nanorod heterostructure performs a much improved photocurrent of 3.87 mA/cm(2) at 1.23 V vs RHE. Such a significant enhancement may result from the significantly enhanced light-harvesting and charge separation efficiency. This rational design of heterostructured photoanodes provides a facile, cost-effective, and scalable strategy to improve PEC performances.
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